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The Dekalb Pest Control Services, Inc. hazardous waste site is on the
property of a single family house located at 135 North Clarendon Drive
in Avondale Estates (Figure 1). The house is bordered by houses to the
north and south, Clarendon Drive to the west, and dense woodland to
the east.

The site was the operating facility for a commercial pesticide
applicator from 1977 until January 1991 when a routine inspection by
the Georgia Department of Agriculture (GDA) led to the discovery and
reporting to Georgia Environmental Protection Division (GEPD) of the
improper disposal of waste pesticide containers and rinsate from
cleaning pesticide applicators in the wooded area behind the house.
Laboratory analysis by GDA of soil samples revealed elevated levels
of three pesticides in soil (Table 1). GEPD requested that the U.S.
Environmental Protection Agency (EPA) conduct an immediate
removal at the site. In response, officials from EPA and the Agency for
Toxic Substances and Disease Registry (ATSDR) conducted a site
inspection and further soil sampling (Table 2). Based on the site
inspection report and EPA and ATSDR staff review of the analytical
data, EPA declined to perform further action [1]. This site entered the
HSI database on November 17, 1994.

In January 1995, GEPD contracted for a sampling and analysis
program to assess the extent of contaminated soil. Initial sampling
results indicated that two pesticides reported to be at elevated levels in
analysis of the 1991 GDA data had decreased through natural
mechanisms (i.e. dilution). Chlordane was the only constituent above
the GEPD Type 1 risk reduction standards (RRS) for chlordane in soil;
therefore, no other pesticides were screened during the succeeding
sampling events [2]. The risk reduction standards established by the
Georgia Rules for Hazardous Site Response define risk levels of
regulated substances that are protective of human health and the
environment. Type 1 standards are health-based cleanup levels for
residential properties and provide for regulated substance
concentrations that pose no significant risk on the basis of standardized
exposure assumptions [3].

A sampling grid, 60 feet by 60 feet (Figure 2), was established by
referencing the Field Assessment Report submitted by EPA and a
visual inspection of the site. Based on analytical results (Table 3) a
quantity of contaminated soil and excavation boundaries were
determined.

In September 1995, GEPD contractors excavated and removed
approximately 50 cubic yards (70 tons) of contaminated soil, which
was incinerated. Following remediation, analytical results indicated
that all chlordane levels were below Type 1 RRS for chlordane in soil
(Table 4). The area was backfilled, graded, and reseeded. Field
activities were completed in October 1995.

In July 1997, GEPD requested that a Compliance Status Report (CSR)
be submitted to GEPD by the current owner of the property prior to
removing the site from the HSI. The CSR requires that additional
sampling be conducted to determine the nature and extent of
background contamination both horizontally and vertically in soil and
groundwater. This health consultation will be amended to include the
results of the CSR and the final decision regarding HSI listing when
data become available.